Bosch rexroth MCL, Project Planning Manual

Page: 193 / 206

14.8 Maintenance and checking of motor components
14.8.1 General
MCL motor components do not require any maintenance. During operation,
however, external influences may cause damage at motor components. With‐
in the service intervals of the machine or system, preventive checking of line‐
ar motor components should be carried out.
14.8.2 Checking of motor and additional components
The following points should be observed and if necessary restored during the
preventive check of motor and auxiliary components:
●
Noticeable sound during operation
● Scratches on primary and secondary part
● Dirt (e.g. shavings, dust, grease by guides etc.) within the air gap be‐
tween primary and secondary part
● State of power and encoder cables in a drag chain.
● State of length measuring system (e.g. contamination)
● State of guides (e.g. deterioration of linear guides)
14.8.3 Electrical check of motor components
Electrical defects at a primary part are can be indicated in advance by meas‐
uring the electrical characteristics. The following variables are relevant:
●
Resistance between motor connecting wires 1-2, 2-3 and 1-3
● Inductance between motor connecting wires 1-2, 2-3 and 1-3
● Insulation resistance between motor connecting wired and guides
Resistance and inductivity The measured values of resistance and inductance can be compared to the
values specified in chapter "Technical data". The individual values of resist‐
ance and inductance measured between the connections 1-2, 2-3 and 1-3
should be identical within a tolerance of ± 5 %. There can be a phase short
circuit, a fault between windings, or a short circuit to ground if one or more
values differ significantly. If so, the primary part must be exchanged.
Insulation resistance The insulation resistance measured between the motor connection wires and
ground should be at least 1 MΩ (MegaOhm). If this value is fallen below, re‐
placement of the primary part is recommended.
If necessary, please contact the Bosch Rexroth customer service
for inspection of the electrical system.
MCL Ironless Linear Motors 185/197
Commissioning, operation and maintenance
R911330592_Edition 06 Bosch Rexroth AG